1 Samuel 28:3-8

Now Samuel had died, and all Israel had mourned for him and buried him in Ramah, his own city. And Saul had put the mediums and the necromancers out of the land. The Philistines assembled and came and encamped at Shunem. And Saul gathered all Israel, and they encamped at Gilboa. When Saul saw the army of the Philistines, he was afraid, and his heart trembled greatly. And when Saul inquired of the LORD, the LORD did not answer him, either by dreams, or by Urim, or by prophets. Then Saul said to his servants, “Seek out for me a woman who is a medium, that I may go to her and inquire of her.” And his servants said to him, “Behold, there is a medium at En-dor.” So Saul disguised himself and put on other garments and went, he and two men with him. And they came to the woman by night. And he said, “Divine for me by a spirit and bring up for me whomever I shall name to you.”